North Korea may now be capable of mounting a nuclear warhead on a medium-range ballistic missile, the New York Times and Reuters reported Wednesday, citing an unnamed South Korean official.

The South Korean government assessed that North Korea now has the ability to sufficiently miniaturize a nuclear device and mount it on a medium-range ballistic missile, such as the North’s Rodong-1 missile.

North Korea announced through its state media on March 9 that it had successfully “standardized” a miniaturized nuclear device, becoming able to mount it onto a ballistic missile. The North’s state media published photographs of leader Kim